Shamusworld >> Repos - architektonas/blob - src/drawingview.cpp

   1 // drawingview.cpp
   2 //
   3 // Part of the Architektonas Project
   4 // (C) 2011 Underground Software
   5 // See the README and GPLv3 files for licensing and warranty information
   6 //
   7 // JLH = James Hammons <jlhamm@acm.org>
   8 //
   9 // Who  When        What
  10 // ---  ----------  -------------------------------------------------------------
  11 // JLH  03/22/2011  Created this file
  12 // JLH  09/29/2011  Added middle mouse button panning
  13 //
  14
  15 // FIXED:
  16 //
  17 //
  18 // STILL TO BE DONE:
  19 //
  20 // - Redo rendering code to *not* use Qt's transform functions, as they are tied
  21 //   to a left-handed system and we need a right-handed one.
  22 //
  23
  24 // Uncomment this for debugging...
  25 //#define DEBUG
  26 //#define DEBUGFOO                              // Various tool debugging...
  27 //#define DEBUGTP                               // Toolpalette debugging...
  28
  29 #include "drawingview.h"
  30
  31 #include <stdint.h>
  32 #include "mathconstants.h"
  33
  34 #include "arc.h"
  35 #include "circle.h"
  36 #include "dimension.h"
  37 #include "drawcircleaction.h"
  38 #include "drawlineaction.h"
  39 #include "line.h"
  40 #include "painter.h"
  41
  42
  43 DrawingView::DrawingView(QWidget * parent/*= NULL*/): QWidget(parent),
  44         // The value in the settings file will override this.
  45         useAntialiasing(true),
  46         scale(1.0), offsetX(-10), offsetY(-10),
  47         document(Vector(0, 0)),
  48         gridSpacing(32.0), collided(false), rotateTool(false), rx(150.0), ry(150.0),
  49         scrollDrag(false), addLineTool(false), toolAction(NULL)
  50 {
  51         setBackgroundRole(QPalette::Base);
  52         setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  53
  54 //      toolPalette = new ToolWindow();
  55 //      CreateCursors();
  56 //      setCursor(cur[TOOLSelect]);
  57 //      setMouseTracking(true);
  58
  59         Line * line = new Line(Vector(5, 5), Vector(50, 40), &document);
  60         document.Add(line);
  61         document.Add(new Line(Vector(50, 40), Vector(10, 83), &document));
  62         document.Add(new Line(Vector(10, 83), Vector(17, 2), &document));
  63         document.Add(new Circle(Vector(100, 100), 36, &document));
  64         document.Add(new Circle(Vector(50, 150), 49, &document));
  65         document.Add(new Arc(Vector(300, 300), 32, PI / 4.0, PI * 1.3, &document)),
  66         document.Add(new Arc(Vector(200, 200), 60, PI / 2.0, PI * 1.5, &document));
  67 #if 1
  68         Dimension * dimension = new Dimension(Vector(0, 0), Vector(0, 0), &document);
  69         line->SetDimensionOnLine(dimension);
  70         document.Add(dimension);
  71 #else
  72         // Alternate way to do the above...
  73         line->SetDimensionOnLine();
  74 #endif
  75 //      connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
  76 //              SLOT(AddNewObjectToDocument(Object *)));
  77 }
  78
  79 void DrawingView::SetRotateToolActive(bool state/*= true*/)
  80 {
  81         rotateTool = state;
  82         update();
  83 }
  84
  85 void DrawingView::SetAddLineToolActive(bool state/*= true*/)
  86 {
  87         if (state)// && toolAction == NULL)
  88         {
  89                 if (toolAction)
  90                         delete toolAction;
  91
  92                 addCircleTool = false;
  93                 toolAction = new DrawLineAction();
  94                 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
  95                         SLOT(AddNewObjectToDocument(Object *)));
  96         }
  97         else if (!state && addLineTool && toolAction)
  98         {
  99                 delete toolAction;
 100                 toolAction = NULL;
 101         }
 102
 103         addLineTool = state;
 104         update();
 105 //printf("DrawingView::SetAddLineToolActive(). toolAction=%08X\n", toolAction);
 106 }
 107
 108 void DrawingView::SetAddCircleToolActive(bool state/*= true*/)
 109 {
 110         if (state)// && toolAction == NULL)
 111         {
 112                 if (toolAction)
 113                         delete toolAction;
 114
 115                 addLineTool = false;
 116                 toolAction = new DrawCircleAction();
 117                 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
 118                         SLOT(AddNewObjectToDocument(Object *)));
 119         }
 120         else if (!state && addCircleTool && toolAction)
 121         {
 122                 delete toolAction;
 123                 toolAction = NULL;
 124         }
 125
 126         addCircleTool = state;
 127         update();
 128 //printf("DrawingView::SetAddCircleToolActive(). toolAction=%08X\n", toolAction);
 129 }
 130
 131 void DrawingView::AddNewObjectToDocument(Object * object)
 132 {
 133         if (object)
 134         {
 135                 object->Reparent(&document);
 136                 document.Add(object);
 137                 update();
 138         }
 139 //printf("DrawingView::AddNewObjectToDocument(). object=%08X\n", object);
 140 }
 141
 142 QPoint DrawingView::GetAdjustedMousePosition(QMouseEvent * event)
 143 {
 144         // This is undoing the transform, e.g. going from client coords to local coords.
 145         // In essence, the height - y is height + (y * -1), the (y * -1) term doing the
 146         // conversion of the y-axis from increasing bottom to top.
 147         return QPoint(offsetX + event->x(), offsetY + (size().height() - event->y()));
 148 }
 149
 150 QPoint DrawingView::GetAdjustedClientPosition(int x, int y)
 151 {
 152         // VOODOO ALERT (ON Y COMPONENT!!!!) (eh?)
 153         // No voodoo here, it's just grouped wrong to see it. It should be:
 154         // -offsetY + (size.height() + (y * -1.0)) <-- this is wrong, offsetY should be positive
 155         return QPoint(-offsetX + x, (size().height() - (-offsetY + y)) * +1.0);
 156 }
 157
 158 void DrawingView::paintEvent(QPaintEvent * /*event*/)
 159 {
 160         QPainter qtPainter(this);
 161         Painter painter(&qtPainter);
 162
 163         if (useAntialiasing)
 164                 qtPainter.setRenderHint(QPainter::Antialiasing);
 165
 166         Painter::screenSize = Vector(size().width(), size().height());
 167         Object::SetViewportHeight(size().height());
 168
 169         // Draw coordinate axes
 170
 171         painter.SetPen(QPen(Qt::blue, 1.0, Qt::DotLine));
 172         painter.DrawLine(0, -16384, 0, 16384);
 173         painter.DrawLine(-16384, 0, 16384, 0);
 174
 175         // Draw supplemental (tool related) points
 176
 177         if (rotateTool)
 178         {
 179                 painter.SetPen(QPen(QColor(0, 200, 0), 2.0, Qt::SolidLine));
 180                 painter.DrawLine(rx - 10, ry, rx + 10, ry);
 181                 painter.DrawLine(rx, ry - 10, rx, ry + 10);
 182         }
 183
 184 // Maybe we can make the grid into a background brush instead, and let Qt deal
 185 // with it???
 186         // Draw grid
 187
 188 #if 0
 189         painter.setPen(QPen(QColor(90, 90, 90), 1.0, Qt::DotLine));
 190
 191         //these two loops kill performance!
 192         // Also, these overwrite our coordinate axes
 193         for(double x=0; x<size().width(); x+=gridSpacing*10.0)
 194                 painter.drawLine((int)x, -16384, (int)x, 16384);
 195
 196         for(double y=0; y<size().height(); y+=gridSpacing*10.0)
 197                 painter.drawLine(-16384, (int)y, 16384, (int)y);
 198 #endif
 199
 200         painter.SetPen(QPen(Qt::black, 1.0, Qt::SolidLine));
 201
 202         for(double x=0; x<size().width(); x+=gridSpacing)
 203                 for(double y=0; y<size().height(); y+=gridSpacing)
 204                         painter.DrawPoint((int)x, (int)y);
 205
 206         // The top level document takes care of rendering for us...
 207         document.Draw(&painter);
 208
 209         if (toolAction)
 210                 toolAction->Draw(&painter);
 211 }
 212
 213 void DrawingView::mousePressEvent(QMouseEvent * event)
 214 {
 215         if (event->button() == Qt::LeftButton)
 216         {
 217                 Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
 218                 collided = document.Collided(point);
 219
 220                 if (collided)
 221                         update();       // Do an update if collided with at least *one* object in the document
 222
 223                 if (toolAction)
 224                         toolAction->MouseDown(point);
 225         }
 226         else if (event->button() == Qt::MiddleButton)
 227         {
 228                 scrollDrag = true;
 229                 oldPoint = Vector(event->x(), event->y());
 230                 // Should also change the mouse pointer as well...
 231                 setCursor(Qt::SizeAllCursor);
 232         }
 233 }
 234
 235 void DrawingView::mouseMoveEvent(QMouseEvent * event)
 236 {
 237         Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
 238
 239         if (event->buttons() & Qt::MiddleButton)
 240         {
 241                 point = Vector(event->x(), event->y());
 242                 // Since we're using Qt coords for scrolling, we have to adjust them here to
 243                 // conform to Cartesian coords, since the origin is using Cartesian. :-)
 244                 Vector delta(point, oldPoint);
 245                 delta /= Painter::zoom;
 246                 delta.y = -delta.y;
 247                 Painter::origin -= delta;
 248                 update();
 249                 oldPoint = point;
 250                 return;
 251         }
 252
 253         // Grid processing...
 254 #if 1
 255         // This looks strange, but it's really quite simple: We want a point that's
 256         // more than half-way to the next grid point to snap there while conversely
 257         // we want a point that's less than half-way to to the next grid point then
 258         // snap to the one before it. So we add half of the grid spacing to the
 259         // point, then divide by it so that we can remove the fractional part, then
 260         // multiply it back to get back to the correct answer.
 261         if (event->buttons() & Qt::LeftButton)
 262         {
 263                 point += gridSpacing / 2.0;                                     // *This* adds to Z!!!
 264                 point /= gridSpacing;
 265                 point.x = floor(point.x);//need to fix this for negative numbers...
 266                 point.y = floor(point.y);
 267                 point.z = 0;                                                            // Make *sure* Z doesn't go anywhere!!!
 268                 point *= gridSpacing;
 269         }
 270 #endif
 271 //we should keep track of the last point here and only pass this down *if* the point
 272 //changed...
 273         document.PointerMoved(point);
 274
 275         if (document.NeedsUpdate())
 276                 update();
 277
 278         if (toolAction)
 279         {
 280                 toolAction->MouseMoved(point);
 281                 update();
 282         }
 283 }
 284
 285 void DrawingView::mouseReleaseEvent(QMouseEvent * event)
 286 {
 287         if (event->button() == Qt::LeftButton)
 288         {
 289                 document.PointerReleased();
 290
 291 //We need to update especially if nothing collided and the state needs to change. !!! FIX !!!
 292 //could set it up to use the document's update function (assumes that all object updates
 293 //are being reported correctly:
 294 //              if (document.NeedsUpdate())
 295 //              if (collided)
 296                         update();       // Do an update if collided with at least *one* object in the document
 297
 298                 if (toolAction)
 299                         toolAction->MouseReleased();
 300         }
 301         else if (event->button() == Qt::MiddleButton)
 302         {
 303                 scrollDrag = false;
 304                 setCursor(Qt::ArrowCursor);
 305         }
 306 }